Babijchuk, V. G., & Kozlov, A. V. (2008). Effect of Extreme Cooling on Indices of Vegetative Regulation of Cardiac Rhythm in Rats of Different Age Groups. Problems of Cryobiology and Cryomedicine, 18(3), 374–378. Retrieved from http://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/415